/*

 * Licensed to the Apache Software Foundation (ASF) under one

 * or more contributor license agreements.  See the NOTICE file

 * distributed with this work for additional information

 * regarding copyright ownership.  The ASF licenses this file

 * to you under the Apache License, Version 2.0 (the

 * "License"); you may not use this file except in compliance

 * with the License.  You may obtain a copy of the License at

 *

 *     http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

package com.bff.gaia.unified.sdk.extensions.euphoria.core.translate;



import com.bff.gaia.unified.sdk.extensions.euphoria.core.client.operator.Union;

import com.bff.gaia.unified.sdk.transforms.Flatten;

import com.bff.gaia.unified.sdk.values.PCollection;

import com.bff.gaia.unified.sdk.values.PCollectionList;

import com.bff.gaia.unified.sdk.values.TypeDescriptor;



/** Euphoria to Unified translation of {@link Union} operator. */

public class UnionTranslator<InputT> implements OperatorTranslator<InputT, InputT, Union<InputT>> {



  @Override

  public PCollection<InputT> translate(Union<InputT> operator, PCollectionList<InputT> inputs) {

    final TypeDescriptor<InputT> outputType = operator.getOutputType().orElse(null);

    return operator

        .getName()

        .map(name -> inputs.apply(name, Flatten.pCollections()).setTypeDescriptor(outputType))

        .orElseGet(() -> inputs.apply(Flatten.pCollections()).setTypeDescriptor(outputType));

  }

}